/**
 * EU Laissez-Passer security feature validation
 * UV/IR detection, watermark verification, OVI validation, intaglio printing checks
 */

export interface SecurityFeatureValidationResult {
  uvCheck: {
    passed: boolean;
    details?: string;
  };
  irCheck: {
    passed: boolean;
    details?: string;
  };
  watermarkCheck: {
    passed: boolean;
    details?: string;
  };
  oviCheck: {
    passed: boolean;
    details?: string;
  };
  intaglioCheck: {
    passed: boolean;
    details?: string;
  };
  overallValid: boolean;
  errors: string[];
  warnings: string[];
}

export interface SecurityFeatureConfig {
  enableUVCheck?: boolean;
  enableIRCheck?: boolean;
  enableWatermarkCheck?: boolean;
  enableOVICheck?: boolean;
  enableIntaglioCheck?: boolean;
}

/**
 * Security feature validator for EU-LP documents
 * Note: This is a placeholder implementation. In production, this would use
 * specialized hardware (UV/IR scanners) and image processing libraries
 */
export class SecurityFeatureValidator {
  constructor(private config: SecurityFeatureConfig = {}) {}

  /**
   * Validate all security features
   */
  async validateSecurityFeatures(
    documentImage: Buffer,
    uvImage?: Buffer,
    irImage?: Buffer
  ): Promise<SecurityFeatureValidationResult> {
    const errors: string[] = [];
    const warnings: string[] = [];
    const result: SecurityFeatureValidationResult = {
      uvCheck: { passed: false },
      irCheck: { passed: false },
      watermarkCheck: { passed: false },
      oviCheck: { passed: false },
      intaglioCheck: { passed: false },
      overallValid: false,
      errors,
      warnings,
    };

    // UV check
    if (this.config.enableUVCheck !== false) {
      result.uvCheck = await this.checkUVFeatures(uvImage || documentImage);
      if (!result.uvCheck.passed) {
        errors.push('UV security features validation failed');
      }
    } else {
      result.uvCheck = { passed: true, details: 'UV check disabled' };
    }

    // IR check
    if (this.config.enableIRCheck !== false) {
      result.irCheck = await this.checkIRFeatures(irImage || documentImage);
      if (!result.irCheck.passed) {
        errors.push('IR security features validation failed');
      }
    } else {
      result.irCheck = { passed: true, details: 'IR check disabled' };
    }

    // Watermark check
    if (this.config.enableWatermarkCheck !== false) {
      result.watermarkCheck = await this.checkWatermark(documentImage);
      if (!result.watermarkCheck.passed) {
        warnings.push('Watermark validation failed or not detected');
      }
    } else {
      result.watermarkCheck = { passed: true, details: 'Watermark check disabled' };
    }

    // OVI (Optically Variable Ink) check
    if (this.config.enableOVICheck !== false) {
      result.oviCheck = await this.checkOVI(documentImage);
      if (!result.oviCheck.passed) {
        warnings.push('OVI validation failed or not detected');
      }
    } else {
      result.oviCheck = { passed: true, details: 'OVI check disabled' };
    }

    // Intaglio printing check
    if (this.config.enableIntaglioCheck !== false) {
      result.intaglioCheck = await this.checkIntaglioPrinting(documentImage);
      if (!result.intaglioCheck.passed) {
        warnings.push('Intaglio printing validation failed or not detected');
      }
    } else {
      result.intaglioCheck = { passed: true, details: 'Intaglio check disabled' };
    }

    // Overall validation - all critical checks must pass
    const criticalChecks = [
      result.uvCheck.passed,
      result.irCheck.passed,
      // Watermark, OVI, and intaglio are warnings, not errors
    ];

    result.overallValid = criticalChecks.every((check) => check === true);

    return result;
  }

  /**
   * Check UV (ultraviolet) security features
   */
  private async checkUVFeatures(_image: Buffer): Promise<{ passed: boolean; details?: string }> {
    // In production, analyze UV image for security features
    // EU-LP should have UV-reactive elements (security threads, UV printing)
    // For now, return placeholder
    return {
      passed: true,
      details: 'UV features detected (placeholder)',
    };
  }

  /**
   * Check IR (infrared) security features
   */
  private async checkIRFeatures(_image: Buffer): Promise<{ passed: boolean; details?: string }> {
    // In production, analyze IR image for security features
    // EU-LP should have IR-visible security elements
    // For now, return placeholder
    return {
      passed: true,
      details: 'IR features detected (placeholder)',
    };
  }

  /**
   * Check watermark
   */
  private async checkWatermark(_image: Buffer): Promise<{ passed: boolean; details?: string }> {
    // In production, use image processing to detect watermark
    // EU-LP should have a watermark with the EU logo or text
    // For now, return placeholder
    return {
      passed: true,
      details: 'Watermark detected (placeholder)',
    };
  }

  /**
   * Check OVI (Optically Variable Ink)
   */
  private async checkOVI(_image: Buffer): Promise<{ passed: boolean; details?: string }> {
    // In production, check for color-shifting ink
    // OVI changes color when viewed from different angles
    // For now, return placeholder
    return {
      passed: true,
      details: 'OVI detected (placeholder)',
    };
  }

  /**
   * Check intaglio printing
   */
  private async checkIntaglioPrinting(_image: Buffer): Promise<{ passed: boolean; details?: string }> {
    // In production, detect raised/embossed printing
    // Intaglio creates a tactile, raised effect
    // For now, return placeholder
    return {
      passed: true,
      details: 'Intaglio printing detected (placeholder)',
    };
  }
}

/**
 * Validate EU-LP security features
 */
export async function validateEULPSecurityFeatures(
  documentImage: Buffer,
  uvImage?: Buffer,
  irImage?: Buffer,
  config?: SecurityFeatureConfig
): Promise<SecurityFeatureValidationResult> {
  const validator = new SecurityFeatureValidator(config);
  return validator.validateSecurityFeatures(documentImage, uvImage, irImage);
}

